Which one is better in speed, bug-free, have anyone tested them? I am planning for dedicated server, and I thing that these web server programs are better than Apache but I don't know which one to choose?
Litespeed & lighttpd are not better than Apache. They all have its own pros and cons. Apache is highly supported and it has a large number of modules etc. However, Litespeed & lighttpd are better for hosting high traffic websites.
You can debate whether or not LiteSpeed is better than Apache, so it's hard to state which one is "better".
Well some negatives on litespeed I can think of are the fact it does cost money and it restricts content (adult content is not allowed). Big reason why I do not use it and stick to lighttpd and apache solid free solutions
The LS enterprise edition prices are ridiculous...atleast for a web server. And when you have free GPL alternatives, who cares? H/W comes cheap now